Hortobágyi Palacsinta (Hungarian Stuffed Pancakes)

Ingredients (serves 4):

For the pancakes:

• 250 g (2 cups) all-purpose flour
• 2 eggs
• 500 ml (2 cups) milk
• Pinch of salt
• Oil for frying

For the filling:

• 300 g (10 oz) cooked chicken (or veal/pork), finely chopped
• 1 onion, chopped
• 2 tbsp oil
• 1 tsp paprika
• 100 ml (½ cup) broth
• Salt and pepper to taste

For the sauce:

• 200 ml (¾ cup) sour cream
• 1 tbsp flour
• 1 tsp paprika